diff --git a/pkgs/development/python-modules/timezonefinder/default.nix b/pkgs/development/python-modules/timezonefinder/default.nix
index a0a72de7bb17..9ad58a97ff4a 100644
--- a/pkgs/development/python-modules/timezonefinder/default.nix
+++ b/pkgs/development/python-modules/timezonefinder/default.nix
@@ -13,16 +13,16 @@
 
 buildPythonPackage rec {
   pname = "timezonefinder";
-  version = "6.2.0";
-  format = "pyproject";
+  version = "6.4.0";
+  pyproject = true;
 
-  disabled = pythonOlder "3.8";
+  disabled = pythonOlder "3.9";
 
   src = fetchFromGitHub {
     owner = "jannikmi";
-    repo = pname;
+    repo = "timezonefinder";
     rev = "refs/tags/${version}";
-    hash = "sha256-n6TcTezu5seKy34KDlzGikAVaqAud00gxywwJA3MaWM=";
+    hash = "sha256-6hcReAzqTp4Od/PJN/W1uz4VS129yMFqQYznbsC/TRY=";
   };
 
   nativeBuildInputs = [
@@ -42,11 +42,6 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
-  postPatch = ''
-    substituteInPlace pyproject.toml \
-      --replace 'numpy = "^1.22"' 'numpy = "*"'
-  '';
-
   pythonImportsCheck = [
     "timezonefinder"
   ];